Angle attachment for dental engines



(No Model.)

G. D. MILLER.

ANGLE ATTACHMENT FOR DENTAL ENGINES.

Patented June 2, 1885.

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CHAUNGEY D. MILLER, OF POUGHKEEPSIE, NEYV YORK.

ANGLE ATTACHMENT FOR DENTAL ENGINES.

SPECIFICATION forming part of Letters Patent No. 319,110, dated June 2, 1885.

Application filed December 27, 1884. (No model.)

To all whom, it may concern.-

Be it known that I, CHAUNGEY D. MILLER, of Poughkeepsie, in the county of Dutchess and State of New York, have invented an improvement in Angle Attachments for Dental Engines, of which the following is aspecification.

This angle-instrument is made for excavating cavities in teeth, and may be added to the usual tool-holder ina hand-piece of a dental engine, or the angle-instruuient may be connected to the rotary shaft of the dental engine.

I make use of a tubular shaft the ends of which are conical. Thishas around it the gear, and it is received into the tubular socket of the angle-instrument, and the same is held by a movable conical ring, the object being to inclose the revolving shaft, so that the centrifugal action will aid in retaining the oil, and the tool is held in a chuck that is double acting and clamped within the shaft itself, so that the power which holds the drill in place does not cause any friction upon the revolving parts.

In the drawings, Figure 1 is a side elevation, and Fig. 2 is a plan View, of the instru- 1ne11t,about the ordinary size. Fig. 3 is alongitudinal section, in a magnified size, of the instrument. Fig. is a detached view of the stock. Fig. 5 is an elevation of the gear and its shaft. Fig. 6 is an elevation, Fig. 7 a section longitudinally, and Fig. 8 a transverse section at a; w, of the tubular arbor. Fig. 9 is an elevation, Fig. 10 a section, and Fig. 11 an end view, of the screw-bearing at the end of the holder. Fig. 12 is an elevation, Fig. 13 is a longitudinal section, and Fig. let an end view, of the tool-holding chuck. Fig. 15 is an elevation, Fig. 16 is a section, and Fig. 17 is an end view, of thescrew-chuck clamp; and Fig. 18 is an inverted plan View of the wrench for tightening or loosening the chuck.

The stock A is screwed at a into the holder 13, and at the outer end of the holder B there is a transverse tubular socket, O, for the parts that hold and revolve the tool.

The stock A and holder B are tubular, and through the former passes the shaft 1), at the end of which is the bevel-gear e. The tubular holder Bis of an internal diameter sufii cient to allow the gear to pass through itfreely, and the gear-shaft D is enlarged at D to fill this tubular holder B, and there is a collar at d, that prevents the gear and shaft moving too far along in the tubular holder B.

Between the end of the tubular stock A, where it is screwed into the tubular holder B, there is a series of longitudinal incisions, d, in the surface of the enlargement D, similar to the openings between gear-teeth, for apurpose hereinafter set forth.

The end of the stock A that passes into the;

holder 13 forms a stop to prevent the gearshaft slipping back.

ithin the tubular socket C- is received the tubular arbor I, around the outside of which are teeth 6, gearing with the teeth of the wheel. 0. The ends of this tubular arbor are tapering, and they are received into hollow tapering bearings at the top andbottom of the sock.- et 0. I have shown the screw-bearingk as of a ring shape, recessed comically at its inner face to receive the upper end of the tubular arbor I, and this screws into the inside of the socket C. At the lower end of the socket O the parts are contracted to form a conical bean ing, it, for the lower end of the tubular arbor I. If desired, there maybe ascrew ring hearing, k, screwed into each end of the tubular socket 0,so as to compensate wear and adj nst the parts so that the gear-teeth properly mesh into each other.

The tool I is of any desired character. The shanks of all tools used with this hand-piece are to he of uniform size, as usual. The chuck s is a tube that is split lengthwise all through it at one side, and there may also be shorter incisions, as shown, so as to make the tube sufliciently elastic. The interior diameter of this chuck-tube corresponds with the toolshanks, so that tools can be placed in or re moved from the chuck easily, and will be clamped in and by the chuck-tube when the latter is contracted.

The tubular arbor I is of a size to receive within it the chuck-tube, and the opening at one end of this tubular arbor is of the same size as the tool-shank. The ends of the chucktube are tapering or conical, and there is a corresponding taper within the tubular arbor near one end, and at the other end is an in ternal screw-thread to receive the screw-clamp t, that is made witha square or head, it, and with a tapering or conical recess for the upper end of the split chuck-tube.

When a tool-shank has been entered in the chuck-tube, the screw-clamp t is screwed down upon the conical end of the chuck-tube, and the endwise pressure causes the chuck to firmly clamp and hold the tool, because the split chuck-tube is pressed together firmly around the tool by the conical or tapering surfaces atits ends. The reverse movement given to the screw-clamp tloosens the tool.

I remark that it is preferable to make the screw-thread on the clamp tleft-han ded, as the drills and bars are usually made to be rotated in the direction of motion of a right-handed screw, and any movement given to the clamp t by the tool will tend to tighten the same.

These parts are simple, easily made, and not liable to'get out of repair.

If the angle-instrument is used with" the hand-piece of an ordinary dental engine," the back end. of the shaft D will be received by the tool-holder, and the tubular stock A will slip over the holder upon the hand-piece. If the angle-instrument is used alone, the rotary shaft will be coupled to the back end of the shaft D, and the flexible covering will pass into and be secured with the said stock A.

In order to apply a wrench to unscrew the screw-clamp t. it is necessary to hold the tubular arbor I stationary. To effect this I employ a lever, I, pivoted at 1), and having a tooth, p", which, when the lever P is swung overinto the position shown by dotted lines in Fig. 3, enters one of the longitudinal channels at d and holds the shaft D from rotating, and by the gearwheels .9 i the tubular arbor is also held. Any suitable wrench or screwdriver maynow be applied to the screwclamp i; but I prefer to use a key or wrench, R, that is at the end of the lever 1 and provided with a square sockct, r, to receive the head of the screw 1. This wrench can be revolved in the eye at the end of the lever 1 so as to turn the said clamp it, there being a lever, r, to the key or wrench R.

In the stock A and holder B there are recesses with raised flanges r at the sides, so as to inclose and shield the lever and wrench when turned back out of the way. This mode of applying the lever and wrench is very convenient, as it retains the parts in position for immediate use in clamping or removing the tool.

I am aware that a tubular shaft has been. used in the tubular socket at the end of a tubular holder, and that conical bearin gs have been applied to the same. In my improvements, the ends of the tubular shaft tapering, thelargest parts of the cones are within the socket, and the oil is not thrown out by centrifugal action. The tool being clamped entirely within the tubular arbor, the strain in clamping does not affect the rotation of the arbor or increase the friction, and the chuck acting at both of its ends on the tool holds the same firmly without catches or looks, and there is a space for lubricating material all around the tubular arbor and the gears.

I claim as my invention- 1. The combination, with the tubular holder and stock screwed together, of the shaft D, the gear at the end thereof, the enlargement D, and the collar (1, resting against a shout der, within the holder, substantially as set forth.

2. The combination, with the tubular arbor having agear around it, of the tubular socket and the ring-formed hearing it, having a conic'al bearing for the end of the tubular arbor, and a screw-thread upon the outside to screw into the tubular socket, substantially as set forth.

3. The combination, with the tubular arbor,

of aslotted tubular chuck having conical ends and a clamp-screw to give pressure endwise upon the chuck and hold the tool, substantially as set forth.

4. The combination, with the holder and its transverse socket, of the shaft D, having incisions in it, the gear-wheels, the tubular arbor, the chuck for holding the tool, a screwclamp for the same, and a lever and tooth to i hold the parts while the chuck is being opened or clamped, substantially as set forth.

5. The lever and tooth pivoted to thetubular holder and the key or wrench upon the same, in combination with the tool-holding 4 chuck, the shaft, gears, and holder of the an gle attachment, substantially as set forth.

Signed by me this 24th day of December, A.

' GHAUNOEY D. MILLER.

\Vitnesses:

H. BEHRENS, Jr., P. L. FOOTE. 

